[Mono-dev] Adding support for try block holes on all archs

[Rodrigo Kumpera]

Hi guys,

The attached patch adds support for holes on all arch but the dead ones
(hppa and alpha). The change is very straight forward
since all it needs is to do is to be called before the first instruction on
the return path from the handler.

The code in ia64 for OP_CALL_HANDLER is pretty complex, the only thing I
don't know is if the next instruction could
be bundled to br_cond. I suppose not, but I rather ask.

On SPARC we're fine since we nop the delay slot.

Does MIPS have a delay slot as well? The code suggests that it does, but I
have no knowledge about it.

Thanks,
Rodrigo
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